CN109460861A - A kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme determines method - Google Patents
A kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme determines method Download PDFInfo
- Publication number
- CN109460861A CN109460861A CN201811217598.4A CN201811217598A CN109460861A CN 109460861 A CN109460861 A CN 109460861A CN 201811217598 A CN201811217598 A CN 201811217598A CN 109460861 A CN109460861 A CN 109460861A
- Authority
- CN
- China
- Prior art keywords
- water
- cooling water
- frequency conversion
- flow
- water pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 288
- 239000000498 cooling water Substances 0.000 title claims abstract description 217
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 170
- 238000005457 optimization Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 58
- 239000000126 substance Substances 0.000 title claims abstract description 18
- 230000003134 recirculating effect Effects 0.000 claims abstract description 75
- 238000005265 energy consumption Methods 0.000 claims abstract description 43
- 230000007613 environmental effect Effects 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims description 74
- 238000004364 calculation method Methods 0.000 claims description 18
- 230000009183 running Effects 0.000 claims description 18
- 238000012546 transfer Methods 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 230000002349 favourable effect Effects 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 238000006467 substitution reaction Methods 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000008235 industrial water Substances 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000008400 supply water Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 description 5
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 210000003296 saliva Anatomy 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012913 prioritisation Methods 0.000 description 2
- 230000026676 system process Effects 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 150000005181 nitrobenzenes Chemical class 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/06—Energy or water supply
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Landscapes
- Business, Economics & Management (AREA)
- Engineering & Computer Science (AREA)
- Economics (AREA)
- Human Resources & Organizations (AREA)
- Strategic Management (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Marketing (AREA)
- General Physics & Mathematics (AREA)
- General Business, Economics & Management (AREA)
- Tourism & Hospitality (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Primary Health Care (AREA)
- Water Supply & Treatment (AREA)
- Development Economics (AREA)
- Game Theory and Decision Science (AREA)
- Entrepreneurship & Innovation (AREA)
- Operations Research (AREA)
- Quality & Reliability (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme determines method, belongs to industrial energy saving emission reduction field.It by considering total system thermal balance, calculates system cooling water minimum under different computing environments operating condition and needs flow, adjust branch pipe valve in parallel, make all branch pipes while meeting minimum to need flow；It calculates and determines that the various lift performance curves in parallel of system water pump and system need lift performance curve；With the minimum target of recirculating cooling water system total power input, it calculates annual each environmental working condition system that calculates and implements water pump selection frequency conversion, fan frequency conversion optimization operating scheme simultaneously, determine the optimal frequency conversion ratio of blower and water pump operation combination and single pump assembly frequency conversion ratio, recirculating cooling water system water pump fan combination frequency conversion optimization operating scheme and other operating scheme energy consumptions are compared in calculating.The result shows that recirculating cooling water system water pump fan combination frequency conversion optimization operating scheme whole year energy consumption proposed by the present invention is minimum, energy-saving effect is significant.
Description
Technical field
The invention belongs to industrial system energy-saving fields, are related to a kind of recirculating cooling water system water pump fan combination frequency conversion optimization
Operating scheme determines method, one kind is particularly related under the premise of meeting user's cooling heat transferring requirement, with recirculated cooling water
The minimum target of the total operation energy consumption of system fan, water pump calculates annual different computing environments operating condition minimum and needs cooling water inflow, really
Determine system water pump blower fan group and closes frequency conversion prioritization scheme.
Background technique
Recirculating cooling water system is widely used in industries, the energy consumptions such as thermal power generation, petrochemical industry, steel-making, papermaking weaving and accounts for
15% or so of social total energy consumption, water withdrawal account for about the 60% of national industrial total water consumption, and energy consumption is high, water consumption is big.With me
The development of state's economy and society, on the one hand, the energy is increasingly in short supply, and on the other hand, enterprise's waste is serious.Recirculating cooling water system section
The water-saving important component for having become national economy energy management of energy, wherein the recirculating cooling water system of petroleum chemical enterprise is whole
Occupy larger specific gravity in a industrial circulating cooling water system.
Currently, in order to ensure safety, in design cycle cooling water system, by being considered further that under annual least favorable environmental working condition
Rich safety coefficient selects water pump and Fan Equipment, causes safety margin excessive；Circulating cooling water system is not carried out in enterprise mostly
Variable working condition optimization of uniting is run, and water pump and blower whole year determine operating condition operation, and annual overwhelming majority time circulating cooling water flow is long-range
In the flow for meeting cooling burden requirement, energy waste is serious；A small number of enterprise implement recirculating cooling water system optimization operations, only
By season regulating system water pump operation number of units by feel, or only consider the reasonable selection of system pump equipment, it is not cold to recycle
But water whole system is research object, and accurate quantification, which calculates, determines optimization operating scheme.
Therefore, the present invention is directed to chemical circulation cooling water system, can satisfy when calculating annual different computing environments operating condition
The system cooling water minimum that user's cooling heat transferring requires needs flow, with the minimum target of system water pump fan total energy consumption, simultaneously
Combination selection and frequency control, fan frequency control are run using water pump assembly, system optimized operation is realized, proposes system optimization
Operating scheme calculates the method for determination.
Summary of the invention
The object of the invention is to for overcome due to current chemical circulation cooling water system whole year determine operating condition operation, operation pipe
The extensive disadvantage for causing energy waste serious is managed, proposes a kind of recirculating cooling water system water pump fan combination frequency conversion optimization operation side
Case determines method, while proposing that chemical circulation cooling water system considers that total system is thermally equilibrated and needs flow based on system minimum
Implement the combination of water pump optimized operation, frequency conversion and blower fan of cooling tower frequency conversion system optimization operating scheme and calculates the method for determination.
The technical scheme is that a kind of recirculating cooling water system water pump fan combination frequency conversion optimization operating scheme determines
Method, comprising the following steps:
A. recirculating cooling water system considers that the thermally equilibrated cooling water minimum of total system needs to flow under different computing environments operating condition
Amount, which calculates, to be determined.
Recirculating cooling water system is made of water circulating pump, user heat-exchange end, cold end heat dissipation equipment and aqueduct.Cooling water
After obtaining hot heating into heat exchanger and cooled medium progress heat exchange, enters cold end heat dissipation equipment through piping and cool down, then by
Water pump pumps to heat exchanger recycling.Cold end heat dissipation equipment generally selects force ventilation Counter-current wet in chemical industry cooling water system
Cooling tower, good cooling results.
It searches and determines engineering 1 year different wet-bulb temperature, dry-bulb temperature, relative humidity meteorologic parameter.Recirculating cooling water system
Cooling water minimum needs flow, the cooling water minimum discharge exactly needed under the premise of meeting cooling require.Cooling water is minimum
Flow rate calculation is needed, needs to consider cooling tower thermodynamic equilibrium and exchanger heat exchange according to qualifications, according to system layout,
It calculates and determines that the recirculating cooling water system cooling water minimum under different computing environments operating condition wet-bulb temperature needs water flow.
What force ventilation reverse flow wet type cooling tower thermodynamic equilibrium utilized be water total heat dissipation capacity it is equal with the reduction of the heat of water
Principle, consider the heat of water that evaporated water is taken away, after amendment, Michael thermodynamic equilibrium equation is as follows:
In formula: Q is circulating cooling water flow, m3/s；βxvFor with volume Evapotranspiration matter coefficient caused by water capacity difference, kg/
(m2·s)；V is the volume of cooling tower filler, m3；K is the heat gain coefficient that evaporated water is taken away, K < 1.0, dimensionless；t1、t2Point
Not Wei into tower water temperature and outlet water temperature, DEG C；Temperature difference of the dt between packing layer infinitesimal height dZ, DEG C；iθIt is θ for air themperature
When specific enthalpy, kJ/kg (DA)；it" it is saturated air specific enthalpy, i.e., when air themperature is that steam partial pressure reaches saturation state temperature
Heat release specific enthalpy when t, kJ/kg (DA)；CwFor the specific heat of recirculated water, kJ/ (kg DEG C) takes 4.1868kJ/ (kg DEG C).
In formula (1), the equation left side is cooling tower filler characteristic quantity, uses Ωn ’It indicates, characteristic, calculation formula is as follows:
Ω′n=B λk (2)
In formula: λ is the mass ratio of air (in terms of dry air) into filler with the recirculated cooling water into filler, kg (DA)/
kg；B, k is the experimental constant of packing, is checked in by table 2 in " Plastic Fill for Cooling Towers heating power and resistance performance are analyzed ".
It is the cooling number of counterflow cooling tower working characteristics in formula (1), on the right of equation, uses ΩnIt indicates, characteristic.Due to
The quadrature conversion that cooling number solves is excessively cumbersome, calculates to be easy, preferably uses multistage Xin Puxun solving method, calculation formula is as follows:
When cooling tower Inlet and outlet water temperature difference t < 15 DEG C and computational accuracy of less demanding, following simplified calculating can be used:
In formula: subscript 1,2, m are respectively cooling tower import, outlet, intermediate position in tower；T is water temperature, DEG C；i”For saturation
Air enthalpy, kJ/kg (DA)；I is air specific enthalpy, kJ/kg (DA).
Containing salts such as calcium carbonate, magnesium carbonate in industrial water, solubility reduces as the temperature rises, after salt is precipitated
It forms dirt knot and is attached to inner wall of the pipe, heat-transfer effect reduces, therefore circulating cooling hydraulic art heat exchange side outlet in shell and tube exchanger
Temperature control is being not higher than 45 DEG C.
Temperature is one of key factor in need of consideration in chemical enginnering process, and the height of temperature often directly affects change
It learns the length in reaction time, influence the conversion ratio and quality of product, therefore the temperature of heat exchanger cooled medium needs strict control.
According to the heat exchange principle of heat exchanger, heat transfer equation is as follows:
Q=h S △ tm (4)
In formula: q is thermic load, kW；H is heat transfer coefficient of heat exchanger, kW/ (m2·℃)；S is heat exchanger heat transfer area, m2；
ΔtmFor logarithmic mean temperature difference (LMTD), DEG C, it is larger that contra-flow heat exchanger exports the Cooling and Heat Source temperature difference, logarithmic mean temperature difference (LMTD) Δ tmCalculation formula
It is as follows:
In formula: thi、thoRespectively cooled medium import and export temperature, DEG C；tci、tcoRespectively cooling water is into and out of water temperature
Degree, DEG C.Heat balance equation is as follows:
qc=Ccmc(tco-tci) (6)
In formula: q=qc, CcFor cooling water specific heat capacity, kJ/ (kg DEG C)；mcFor cooling water mass flow, kg/s.By formula
(4)~(5) bring formula (6) into, derive heat exchanger cooling water flow are as follows:
In formula (7), when cooling water outlet temperature be maximum permissible temperature, that is, take tco=tcomaxAt=45 DEG C, mcIt is as cold
But water minimum needs flow.
Recirculating cooling water system cooling water minimum needs in the solution of flow, need heat exchanging device cooling water outlet temperature and by
The temperature of cooling medium is controlled, and considers the thermally equilibrated recirculating cooling water system of cooling tower, and system cooling water minimum needs
Flow is that each heat exchangers in parallel minimum needs the sum of cooling water flow in system, and calculation formula is as follows:
In formula: QzTotal flow, m are needed for recirculating cooling water system cooling water minimum3/s；QiMost for i-th layer of cooling water of system
It is small to need volume flow, m3/s；mc,iMass flow, kg/s are needed for i-th layer of cooling water minimum；N is the number of plies in parallel in system；ρ
For cooling water density, kg/m3。
Ignore the thermal loss and water loss of pipeline in recirculating cooling water system, it is known that cooling load, the practical pipe of system
Road characteristic, the peak optimization reaction temperature of cooled medium and cooling water outlet maximum permissible temperature are iterated to calculate out not by programming
Water flow is needed with recirculating cooling water system cooling water minimum under environment temperature.
Heat Balance Calculation process are as follows: wet-bulb temperature t is first setsOutlet water temperature t as cooling tower2, as technique exchange heat side
Inlet water temperature considers that each parallel branch cooled medium is cooling and requires, while controlling heat exchanger cooling water outlet temperature tco≤45
DEG C and the temperature of cooled medium meet the requirements, using formula (7) and formula (8) be calculated after each parallel branch heat exchange out
Saliva temperature tcoiWith corresponding cooling water flow Qi(i represents parallel branch number).Changed by adjusting parallel branch return water tube valve
Each branch runs water flow QiIt meets the requirements, each way outlet cooling water is mixed to get technique heat exchange side outlet main pipe cooling water
Temperature t1With total flow Qz, as cooling tower is re-circulated into cooling tower and carries out heat exchange heat dissipation into tower water temperature and water flow, utilizes
Formula (1)~(3), the outlet water temperature t that will be obtained2 ’With the outlet water temperature t of last cycle calculations2It is compared, if | t2 ’- t2
|≤0.001, then system process heat exchange side and cooling tower heat exchange side reach thermal balance, obtain the cooling water total flow of system at this time
QzWith ventilation quantity G；If | t2 ’- t2| > 0.001, the two difference is larger, then with this outlet water temperature t2' substitute into re-start to recycle and count
It calculates, until thermal balance.Each branch cooling water flow is that the minimum of corresponding branch needs flow when thermal balance, and total cooling water flow is
Flow is needed for system cooling water minimum.
B. recirculating cooling water system water pump parallel connection lift performance curve and system need lift performance curve to calculate determination.
According to the method that all pump head performance curve abscissas-i.e. flow for participating in parallel running is added, calculate true
Determine the lift performance curve of system water pump assembly difference parallel combination operation, formula is as follows:
Hpbj=AjQ2+BjQ+Cj (9)
In formula: j is different water pump selections number, including+1 big pump of 1 big pump, 1 small pump, 1 small pump, 2 big pump；
A, B, C are multinomial coefficient；HpbFor water pump parallel connection lift, m.
Since the aggregation point distance of each parallel pipeline exit of pump to main pipe is shorter, each branch drag losses are ignored.
The system for determining the operation of system water pump assembly difference parallel combination needs lift performance curve, and formula is as follows:
Hr=Hz+SrQ2 (10)
In formula: HrLift, m are needed for system；HzFor Unit head, the i.e. outlet of system return pipe and water feeding of water pump water face
Between height difference, m；SrFor system pipeline hydraulic resistance coefficient, s2/m5。
Requirement of the system in addition to pipeline to be met, heat exchange equipment to pressure limit also should ensure that system least favorable point to pressure
The requirement of power need to carry out pressure check to water pump actual operating mode point, guarantee system operation under positive pressure.
C. recirculating cooling water system considers that the thermally equilibrated blower of total system determines operating condition water pump selection frequency conversion optimization operating scheme
It calculates and determines.
In recirculating cooling water system, blower determines revolving speed operation, and water pump can carry out the operation of operation number of units Combinatorial Optimization, combination becomes
Valve optimization operation, combination frequency control optimization operation.Water pump operation number of units Combinatorial Optimization operation, according to different computing environments operating condition
It includes number of units and size that lower recirculating cooling water system, which considers that the thermally equilibrated cooling water minimum of total system needs flow selection water pump,
Optimized operation combination, avoids flow is excessive from causing energy waste.But the operation of number of units Combinatorial Optimization is run, is cooled down in most cases
Water flow is still excessive, causes energy waste, if reducing 1 operation water pump, water-supply shortages；Water pump selection becomes valve optimization
Operation changes system pipe network necessary head curve of the installation system by controlling opening of valve, and regulating system circulating water flow controls each parallel connection
Branch meets the water flow of load heat transfer requirements, reduces annual operation energy consumption, but valve regulated increases resistance of pipe system, causes
Energy consumption increase；Water pump selection frequency control optimization operation, on the basis of water pump operation number of units Combinatorial Optimization, according to water pump machine
Group Variable Frequency Speed Regulation Principle implements a water pump assembly for participating in running under the premise of meeting cooling water minimum and needing flow
Frequency control operation, can be significantly reduced system energy consumption.With the raising of frequency converter reliability and the reduction of equipment price, frequency conversion
Speed regulation has been widely used.Therefore, recirculating cooling water system water pump assembly optimal operation mode is combination frequency control optimization fortune
Row.
(1) combination of water pump optimized operation and its range of flow determine.
To meet the pressure requirements at system least favorable, the water pump size combinations method of operation is set, by pump head performance
Curve and system need lift performance curve simultaneous solution, determine that water pump operation operating point is that water pump difference runs combined boundary
Point, A, B, C, D point as shown in Figure 1.
In Fig. 1, Hp2、Hp1、Hpb12、Hpb11The respectively small pump of water pump separate unit, the big pump of separate unit, 1 big 1 small pump group conjunction and 2 big pumps
Combined flow-lift performance curve, HrLift performance curve is needed for system.When system cooling water minimum needs flow to be less than
QAWhen, select the small pump operation of separate unit；When system cooling water minimum needs flow in QA~QBBetween when, select the big pump operation of separate unit；
When system cooling water minimum needs flow in QB~QCBetween when, select the 1 big 1 small pump parallel running of pump；When system cooling water
Minimum needs flow in QC~QDBetween when, select 2 big pump parallel runnings.
(2) water pump selection frequency conversion optimization operating scheme, which calculates, determines.
Flow selection water pump optimized operation combination is needed according to system minimum, usual system cooling water flow is still greater than system
Cooling water minimum needs flow, and it is inadequate to open a unit flow less, at this point, passing through separate unit water pump assembly frequency conversion optimization fortune again
Row further decreases energy consumption under the premise of meeting cooling require.There are two types of single pump frequency conversion running optimizatin methods: most with system
It is small to need water flow to determine single pump optimized operation revolving speed, water pump optimized operation revolving speed is determined with variable frequency pump efficiency highest.Exist again
In both frequency conversion optimization methods, the frequency conversion optimization method finally used is determined with energy consumption minimum: being needed with system cooling water minimum
Flow is wanted to determine that single pump operation revolving speed carries out water pump selection frequency conversion optimization operation.
By taking system only runs 1 big pump as an example, illustrate that separate unit pump variable frequency optimizes operation logic.
Such as Fig. 2, flow is needed to select 1 small pump operation according to system cooling water minimum, flow is inadequate；Selection 1 big pump
Operation, flow is excessive, then needs to carry out selected big pump the optimization operation of frequency conversion reduction of speed, water pump operation flow is made to be exactly equal to system
Cooling water minimum needs flow.Figure midpoint N is the big pump lift performance curve H of separate unitp1Lift performance curve H is needed with systemr's
Intersection point, N point flow are greater than system cooling water minimum and need flow Qrmin.Flow is needed according to system cooling water minimum and is met just
The minimum lift of pressure determines point O, and by water pump assembly frequency conversion, water pump is run in this operating point.Point O and coordinate origin are crossed, is made
Similar operating condition parabola Hs, with water pump rated speed lift performance curve intersection point O ', according to affinity law of pump, O point efficiency is approximate
Equal to O ' point efficiency, the ratio of O point flow and O ' point flow is frequency conversion ratio δpn, obtain pump head performance curve H after frequency conversionbp1
It indicates are as follows:
When needing two pump parallel running of flow selection according to system cooling water minimum, a water pump assembly rated speed fortune
Capable, another water pump assembly converting operation operating point determines as shown in Figure 3.
As shown in figure 3, water pump needs to run on lift performance curve in system, need to flow according to system cooling water minimum
Amount selection optimal pump operation group is combined into 2 big pump parallel runnings, and determines water pump correspondence system is most on necessary head curve of the installation system
The small O point for needing flow operates to optimal, and a pump rated speed is in point ObPlace is run, in point O after another pump frequency conversionaPlace's fortune
Row.Cross point OaAnd coordinate origin makees similar operating condition parabola Hs, with water pump rated speed lift performance curve intersection point O 'a, OaPoint effect
Rate is approximately equal to O 'aCooling water flow can be adjusted to minimum and needed at water flow point O by point efficiency, not needed by adjusting system
System resistance coefficient changes system and needs lift performance curve, it is only necessary to by single pump lift performance curve Hp1It is adjusted to curve Hbp1。
Meet system cooling water minimum need flow and supply water positive pressure request under the premise of, annual different computing environments work
When condition, mathematic optimal model is established with the minimum target of pump assembly input power.
When system separate unit water pump operation and converting operation, objective function is as follows:
In formula: NpbpFor water pump assembly input power, kW；ηpFor pump efficiency；ηcIt is imitated for the transmission of water pump and necessary electromotor
Rate；ηemMotor efficiency when for water pump operation；ηbpFor water pump assembly frequency converter efficiency；δnFor gear ratio.
Constraint condition:
In formula: QrminFlow, m are needed for system cooling water minimum3/s；QpmaxFor water pump maximum critical flow, m3/s；
Npemin、NpemaxRespectively separate unit water pump assembly allows minimum power input, allows maximal input.Traffic constraints condition table
Show that separate unit water pump operation flow must satisfy the requirement that system minimum under different computing environments operating condition needs flow, and is no more than institute
There is total maximum stream flow of operation water pump；Power constraints indicate the control of separate unit water pump assembly input power in reasonable pump assembly
In input power range；Gear ratio constraint condition indicates the allowed band of separate unit water pump gear ratio or frequency conversion ratio, frequency conversion than too small,
Pump efficiency decline is obvious；Frequency conversion influences water pump assembly safety than excessive.
When 2 parallel connection pumps of system, single pump frequency conversion operation, a rated speed, another converting operation, mesh are controlled
Scalar functions:
Constraint condition:
In formula: subscript 1 indicates variable frequency pump unit, and subscript 2 indicates not frequency conversion water pump assembly.
Add up each calculating environmental working condition when blower and pump energy consumption, obtain recirculating cooling water system whole year operation total energy consumption, meter
It is as follows to calculate formula:
In formula: m is annual different computing environments operating condition setting kind number, i.e., annual system minimum needs flow kind number；NfeεFor
ε kind calculates environmental working condition rated speed blower unit input power, kW；NpbpεEnvironmental working condition variable frequency pump is calculated for ε kind
Unit input power, kW；thεEnvironmental working condition system operation time, h are calculated for ε kind；AzTotal energy consumption is run for system whole year,
kW·h。
D. recirculating cooling water system considers that total system is thermally equilibrated while implementing water pump selection frequency conversion, fan frequency conversion optimization fortune
Row scheme, which calculates, to be determined.
Since blower angular adjustment is inconvenient and angle modulation is costly, so blower optimization operation selection fixed blade established angle
Frequency control optimizing operation method.Under the premise of guaranteeing cooling purpose, with the annual total operation energy consumption of cooling water system water pump fan
Minimum target, while implementing water pump selection frequency conversion, fan frequency conversion optimization operation.
Specific method: setting fan frequency conversion is than range 0.6~1.1, when certain wet-bulb temperature, turns to the blower of any determination
Speed, the method for applying step A~C determine that water pump selection frequency conversion optimizes operating scheme, calculate water pump when multiple rotation speed of fan
It combines frequency conversion and optimizes operating scheme, blower, water pump and system total power input and the relationship of fan frequency conversion ratio are as shown in Figure 4.
Such as Fig. 4, when a certain wet-bulb temperature, when recirculating cooling water system blower fan of cooling tower frequency conversion is smaller, rotation speed of fan compared with
Low, power is smaller, but air quantity is also smaller, and cooling tower cooling effect is poor, is system cooling effect, it is desirable that system cooling water flow
Larger, water pump assembly input power is larger.With the increase of fan frequency conversion ratio, rotation speed of fan and power increase, cooling tower ventilation
Cooling effect improves, and cooling water minimum needs flow to reduce, and pump power decline, recirculating cooling water system total power input first drops
Increase after low, obtains corresponding blower optimal frequency conversion ratio δ when system total power input minimumfnopt.Method according to this calculates whole year not
With the corresponding optimal frequency conversion of blower is when recirculating cooling water system total power input minimum when wet bulb temperature calcuation environmental working condition
Corresponding water pump operation combination and separate unit frequency conversion ratio are as shown in figure 5, so that it is determined that the combination of recirculating cooling water system water pump fan becomes
Frequency optimization operating scheme.
E. recirculating cooling water system considers that the thermally equilibrated water pump fan combination frequency conversion of total system optimizes operating scheme energy consumption ratio
Compared with.
Calculating compares that recirculating cooling water system original blower fan water pump whole year determines operating condition operating scheme energy consumption, blower determines operating condition water pump
It combines frequency conversion optimization operating scheme energy consumption and fan frequency conversion water pump selection frequency conversion optimizes operating scheme energy consumption, it is clear that the third: it is same
When implement water pump selection frequency conversion, fan frequency conversion optimization operating scheme-water pump fan combination frequency conversion optimization operating scheme whole year energy
Consumption is minimum.
The invention has the benefit that a kind of chemical circulation cooling water system water pump fan provided by the invention combines frequency conversion
Optimization operating scheme determines method, and the optimization applied to recirculating cooling water system is run, prioritization scheme clear principle, embodiment meter
Show recirculating cooling water system using annual water pump selection frequency conversion, fan frequency conversion optimization operating scheme, more former blower fan water pump is fixed
Operating condition operating scheme, annual energy conservation 70.34%；Operating condition water pump selection frequency conversion optimization operating scheme, annual energy conservation are determined compared with blower
14.01%.Therefore, recirculating cooling water system water pump fan combination frequency conversion optimization operating scheme energy-saving effect proposed by the present invention is aobvious
It writes.
Detailed description of the invention
Fig. 1 is that system water pump difference number of units parallel combination runs lift performance curve and assembled scheme determines and schemes.
Fig. 2 is that single pump assembly frequency conversion optimizes the determining figure of running operating point.
Fig. 3 is two pump parallel runnings, wherein a pump frequency conversion optimizes the determining figure of running operating point.
Fig. 4 is each input power of fan frequency conversion recirculating cooling water system and fan frequency conversion ratio based on water pump selection frequency conversion
Relational graph.
Fig. 5 is the optimal frequency conversion ratio of blower and wet-bulb temperature relational graph.
Fig. 6 is that embodiment recirculating cooling water system simplifies distribution map.
Fig. 7 is embodiment recirculating cooling water system heat calculation method schematic diagram.
Fig. 8 is embodiment system water pump optimum combination operating scheme flow boundary figure.
Fig. 9 is that embodiment blower determines operating condition water pump selection frequency conversion optimization operation water pump fan input power and wet-bulb temperature closes
System's figure.
Figure 10 is that the frequency conversion of embodiment water pump selection optimizes runtime system input power and fan frequency conversion compares relational graph.
Figure 11 is the optimal frequency conversion ratio of embodiment blower and wet-bulb temperature relational graph.
Figure 12 is each operating scheme input power of embodiment system and wet-bulb temperature relational graph.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, but the present embodiment should not be construed as to the present invention
Limitation.
Certain chemical workshop recirculating cooling water system is made of cooling tower, water circulating pump, transmission and distribution network and process equipment, annual
Operation 360 days, the production for 30,000 tons of aniline, 50,000 tons of nitrobenzenes.System is furnished with 2 parallel connection LDCM-800SC type force ventilations
Reverse flow wet type cooling tower, fountain is cooling, and every cooling tower installs a Fans, and blower model LF-42 matches Y180L-4 type three
Phase asynchronous motor, LJ3 type speed reducer；3 big pump is in parallel, and dual-purpose one is standby, big pump type 350S44A, single pump designs flow
1116m3/ h, rated lift 36m, rated speed 1450r/min, the mating Y315L-4 type motor of water pump, rated current 288A,
Rated power 160kW, electric efficiency 91.9%, rated speed 1450r/min.A small pump in parallel, model KQL300/525-
90/6, single pump designs flow 0.167m3/ s, rated lift 38m, rated speed 980r/min, necessary electromotor power are 90kW,
Asynchronous machine is 6 poles, set drive efficiency etac=100%.
Cooling technique equipment is divided into four layers, for for the various heat exchangers for producing aniline, cooler, vacuum pump, hydrogen compressor etc..
Equipment is distributed by layer, and system is equivalent to that there are five heat exchange user groups in parallel, wherein first, second, third layer of every layer of equipment is simultaneously
Connection connection, the 4th layer has three equipment, two equipment parallel connections of secondary high point, and the tables of equipment of highest point alone becomes as a branch, all
It is in parallel with other three-layer equipments.It is connected by several valve members with transmission and distribution pipeline between each equipment, it is as shown in Figure 6 that system simplifies distribution.
The technique heat exchange each layer heat exchange property relevant parameter list in side summarizes such as table 1 after system is simplified:
The 1 each layer heat exchange equipment correlation performance parameters in embodiment technique side of table
A. recirculating cooling water system considers that the thermally equilibrated cooling water minimum of total system needs to flow under different computing environments operating condition
Amount, which calculates, to be determined.
Recirculating cooling water system cooling water minimum needs the factors such as the cooling capacity of flow and air's wet bulb temperature, cooling tower
It is related.
The calculating environmental working condition of the present embodiment location whole year is counted, as shown in table 2 with nearly 10 annual mean.
2 embodiment engineering location whole year meteorologic parameter of table
Cooling water minimum when system reaches thermal balance at a temperature of different wet bulbs needs flow rate calculation loop iteration solution side
Method principle is as shown in Figure 7.
As shown in fig. 7, first with wet-bulb temperature tsOutlet water temperature t as cooling tower2, ignore system pipe network thermal loss, then
The outlet water temperature is technique heat exchange side-entrance water temperature, by each parallel branch flow resistance coefficient of table 1 and general pipeline flow resistance system
Number needs lift performance curve according to pump (parallel connection) flow-lift performance curve and system, each branch water flow of solving system with
Total flow.By the out temperature and load of each parallel branch of table 1 heat exchange side cooled medium, heat exchanging device cooling water outlet
The temperature of temperature and cooled medium is controlled, and calculates to obtain going out after the heat exchange of each parallel branch using formula (7) and formula (8)
Saliva temperature tcoiFlow Q is needed with corresponding cooling water minimumi(i represents parallel branch number), control heat exchanger exit water temperature is not high
In 45 DEG C.When actual motion, change each branch cooling water flow Q by adjusting each branch road valve aperturei, branch and total loop stream
Dynamic resistance also changes simultaneously.Each branch water outlet is mixed to get technique heat exchange side outlet main pipe coolant-temperature gage t1With total Water Qz, as into
Tower water temperature and water flow radiate into cooling tower cooling heat transferring, are calculated using formula (1)~(3), the outlet water temperature that will be obtained
t2' outlet water temperature t with last cycle calculations2It is compared, if | t2’-t2|≤0.001, then system process heat exchange side and
Cooling tower heat exchange side reaches thermal balance, obtains the cooling water total flow Q of system operation at this timezWith ventilation quantity G, if | t2’-t2| >
0.001, then cycle calculations are re-started with the substitution of this outlet water temperature, until thermal balance, when thermal balance, each bypass flow was
The minimum of corresponding branch needs flow, and total cooling water flow is that system cooling water minimum needs flow.Using formula (1)~(8),
Operating system cooling water minimum needs flow when calculating annual each calculating environmental working condition, and the results are shown in Table 3.
When the annual varying environment temperature system thermal balance of table 3 cooling water minimum need flow with into outlet water temperature
As shown in Table 3, whole year, the raising of cooling tower outlet water temperature, temperature difference between the inlet and outlet water was gradually with the rising of wet-bulb temperature
Reduce, system heat balance cooling water minimum needs flow to be gradually increased, and wet-bulb temperature is higher, increases the system of unit temperature most
It is small to need flow increase faster.
Whole year select 5 DEG C of wet-bulb temperature, 10 DEG C, 15 DEG C, 20 DEG C, 25 DEG C be calculating environmental working condition, each heat exchangers in parallel goes out
Saliva temperature is former to be greater than 45 DEG C, is now controlled with 45 DEG C so that the cooling water side average temperature of heat exchange equipment reduces, hot side it is cold
But the mean temperature of medium accordingly reduces, and meets technique heat transfer requirements, at this point, each branch in parallel of user side when due to system heat balance
The pipeline heat exchanger cooling water outlet and inlet temperature difference is constant, and each branch cooling water flow is corresponding with each load proportional.When wet bulb temperature
When degree is 30 DEG C, heat exchanger exit water temperature is less than 45 DEG C, if being controlled with 45 DEG C, heat exchanger cooling water side average temperature is increased, heat
Side mean temperature accordingly increases, and technique requirement is not achieved, at this point, should require to determine cooling water with the technological temperature of cooled medium
Flow, heat exchanger cooling water leaving water temperature is less than 45 DEG C.
B. recirculating cooling water system water pump parallel connection lift performance curve and system need lift performance curve to calculate determination.
The lift performance curve of different water pump selection parallel runnings is determined according to pump performance；It is formed according to system and determines system
System needs lift performance curve.Large and small pump performance parameter substitution formula (9) is respectively obtained into 1 big pump lift performance curve, 1
Small pump lift performance curve, 1 big pump and 1 small pump lift performance curve in parallel, 2 big pump lift performance curve in parallel:
Hp1=-148.15Q2+3.3026Q+48.986 (9-1)
Hp2=-425.7054Q2+52.3839Q+41.7247 (9-2)
Hpb12=-123.4998Q2+66.7469Q+33.5468 (9-3)
Hpb11=-37.038Q2+1.5163Q+48.986 (9-4)
System structure parameter substitution formula (10) is obtained into system necessary head curve of the installation system:
Hr=4.8+180.27Q2 (10-1)
Through checking, different each lift performance curves of water pump selection and system need water obtained by lift performance curve simultaneous solution
Pump operation operating point lift is able to satisfy the positive pressure request of user heat-exchange end.
C. recirculating cooling water system considers that the thermally equilibrated blower of total system determines operating condition water pump selection frequency conversion optimization operating scheme
It calculates and determines.
(1) combination of water pump optimized operation and its range of flow determine.
As shown in Figure 1, the flow of separation A, B, C, D of water pump operation combination are respectively 0.3757m3/s、0.3017m3/
s、0.4307m3/ s and 0.4563m3/ s, the selection scheme that system optimal runs number of units combination are as shown in Figure 8.
As shown in figure 8, when system minimum needs flow to be less than 0.3017m3When/s, the small pump operation of separate unit is selected；Work as system
Minimum needs flow in 0.3017m3/ s~0.3757m3When between/s, the big pump operation of separate unit is selected；When system minimum needs flow
In 0.3757m3/ s~0.4307m3When between/s, 1 big pump, 1 small pump parallel running is selected；When system minimum needs flow to exist
0.4307m3/ s~0.4563m3When between/s, 2 big pump parallel running is selected.
(2) water pump selection frequency conversion optimization operating scheme, which calculates, determines.
Flow selection water pump optimized operation combination is needed according to system minimum, changes a wherein water pump using frequency control
Lift performance curve, pump head performance curve such as formula (11) after frequency conversion make system cooling water flow be exactly equal to minimum needs
Flow, single pump operation frequency conversion optimization operating point determines principle as shown in Fig. 2, two pump one pump frequency conversion of parallel running optimization operating conditions
Point determines that principle is as shown in Figure 3.Applying equation (12)~(13) or (14)~(15) and formula (16), at a temperature of calculating different wet bulbs
Pump assembly input power, matched with blower power input to machine and recirculating cooling water system total power input such as table 4.
Blower determines operating condition water pump selection frequency conversion optimization operation energy consumption calculated result at a temperature of the different wet bulbs of table 4
In table 4, recirculating cooling water system cooling water total flow is adjusted to each wet using water pump optimum organization conversion system
System minimum needs flow when ball temperature.As shown in figure 9, system cooling water minimum needs to flow when ambient wet bulb temperature increases
Amount increases, and pump assembly input power increases, and blower unit input power reduces, and system total power input increases, and with wet bulb temperature
Degree increases, and the increase of system total power input is faster.In turn, system cooling water flow is smaller, then system total power input is smaller,
It is more energy saving.
Blower determines revolving speed water pump selection frequency conversion optimization operating scheme, and on water pump optimized operation combination foundation, system needs
Lift performance curve is constant, changes a water pump operation operating point by frequency control, adjusts water pump total flow and is decreased to be equal to
System minimum needs flow, reduces water pump assembly operation power and system total power input, saves operation energy consumption.
D. recirculating cooling water system considers that total system is thermally equilibrated while implementing water pump selection frequency conversion, fan frequency conversion optimization fortune
Row scheme, which calculates, to be determined.
Under the premise of guaranteeing cooling purpose, with cooling water system water pump, wind under annual each calculating ambient wet bulb temperature operating condition
Machine runs the minimum target of total energy consumption, while implementing water pump selection frequency conversion, fan frequency conversion Operation Mode Optimization.Specific method: it sets
Fan frequency conversion is determined than range 0.6~1.1, when certain wet-bulb temperature, to the rotation speed of fan of any determination, the side of applying step A~C
Method determines that water pump selection frequency conversion optimizes operating scheme, calculates water pump selection frequency conversion optimization operation side when multiple rotation speed of fan
Case obtains the relationship of blower unit input power, water pump assembly input power and system total power input Yu fan frequency conversion ratio,
In, make the optimal frequency conversion ratio of the smallest fan frequency conversion ratio blower of system total power input, operating scheme is circulating cooling water system
System water pump selection frequency conversion, fan frequency conversion optimize operating scheme.With wet-bulb temperature tsFor=5 DEG C, each input power of system and wind
Machine frequency conversion is more as shown in Figure 10 than relationship.With the increase of fan frequency conversion ratio, fan delivery increases, and blower unit input power increases
Add, and increases and be getting faster, and cooling water minimum needs flow to be gradually reduced, pump assembly input power is gradually reduced, and is reduced
More and more slowly, system total power input first reduces to be increased afterwards, obtains the optimal change of blower when system total power input minimum
Frequency ratio is 0.87.
5 embodiment wet-bulb temperature t of tablesThe optimal frequency conversion of water pump selection frequency conversion optimization operating scheme blower is than determining at=5 DEG C
With the raising of ambient wet bulb temperature, system cooling water minimum needs water flow to increase, water pump assembly input power
Proportion increases in system total power input.At this point, to meet cooling requirement just, increasing to any wet-bulb temperature environment
Add fan frequency conversion ratio, then can reduce cooling water flow, reduces water pump assembly power, but the incrementss of blower unit input power
The optimal frequency conversion of blower much smaller than the reduction amount of water pump assembly input power, therefore when system total power input minimum increases, but is
Guarantee fan safe operation, frequency conversion is than maximum no more than 1.1.Recirculating cooling water system is same when calculating annual different wet-bulb temperature
When fan frequency conversion when implementing water pump selection frequency conversion, fan frequency conversion total power input minimum than as shown in figure 11.
With the minimum target of recirculating cooling water system total power input, the different optimal frequency conversions of wet-bulb temperature blower are calculated than system
The annual each wet bulb temperature calcuation environmental working condition energy consumption of system, as a result arranges as shown in table 6.
Water pump fan combination frequency conversion optimization operating scheme and energy when 6 embodiment recirculating cooling water system difference wet-bulb temperature of table
Consumption
It can be obtained by Figure 11 and table 6, with the raising of wet-bulb temperature, recirculating cooling water system water pump fan combines frequency conversion optimization
Operating scheme fan operation air quantity increases, and circulating cooling water flow increases, and blower unit and water pump assembly input power increase.
When wet-bulb temperature is less than 20 DEG C, system only needs 1 small pump operation, and the optimal frequency conversion ratio of blower gradually increases with wet-bulb temperature raising
Greatly；When wet-bulb temperature is 25 DEG C, 1 small pump is unable to satisfy cooling requirement, needs to be changed to 1 big pump operation, and minimum needs cold
But water flow increased dramatically, and the optimal frequency conversion ratio of blower is declined slightly.When wet-bulb temperature is 30 DEG C, 1 big 1 small pump operation is selected,
Since water pump assembly input power is much larger than blower unit input power, also, blower unit when increase fan frequency conversion ratio at this time
The increase of input power is much smaller than the reduction amount of water pump assembly input power, to reduce system total power input, should increase as far as possible
Big fan frequency conversion ratio, but consider the too fast influence fan safe of rotation speed of fan, therefore the optimal frequency conversion ratio of blower is limited to 1.1, this
When, system total power input under the premise of meeting cooling requirement and safe operation is minimum.
E. recirculating cooling water system considers that the thermally equilibrated water pump fan combination frequency conversion of total system optimizes operating scheme energy consumption ratio
Compared with.
Annual varying environment operating condition wet-bulb temperature is different, and the optimal frequency conversion ratio of blower is also different.When calculating different wet-bulb temperature
Former blower fan water pump determines operating condition, blower determines operating condition water pump selection frequency conversion optimization and implements fan frequency conversion water pump selection frequency conversion optimization simultaneously
The system input power and different computing environments operating condition the third operating scheme described above of three kinds of operating schemes are relative to
A kind of, second operating scheme energy saving of system rate, the results are shown in Table 7.
System water pump blower fan group closes frequency conversion optimization energy saving in running rate when 7 embodiment difference wet-bulb temperature of table
Determine that operating condition is run, blower determines operating condition water pump selection frequency conversion excellent for original blower fan water pump when different wet-bulb temperature in comparison sheet 7
Change the variation tendency of the system input power of operation and fan frequency conversion water pump selection frequency conversion optimization operation, as shown in figure 12.
It can be obtained by table 7 and Figure 12, primitive root determines operating condition according to the system whole year blower fan water pump that annual least favorable environmental working condition determines
Operating scheme causes mass energy to waste.Blower determines operating condition water pump selection frequency conversion optimization operation and fan frequency conversion water pump selection becomes
Frequency optimization two kinds of optimization operating scheme recirculating cooling water system total power inputs of operation increase with wet-bulb temperature and are increased, when wet
When ball temperature is higher, system implements fan frequency conversion simultaneously, the optimization operating scheme total power input energy conservation of water pump selection frequency conversion is shown
It writes, for example, determining operating condition water pump selection frequency conversion optimization operating scheme relative to blower, fractional energy savings reaches when wet-bulb temperature is 30 DEG C
15.66%.
It is more as shown in table 8 to calculate each operating scheme whole year total energy consumption of recirculating cooling water system.
Each operating scheme whole year total energy consumption of 8 system of table compares
Embodiment calculation shows that, recirculating cooling water system optimizes operation side using annual fan frequency conversion water pump selection frequency conversion
Case, more former blower fan water pump determine operating condition operating scheme, annual energy conservation 70.34%；Operating condition water pump selection frequency conversion optimization fortune is determined compared with blower
Row scheme, annual energy conservation 14.01%.Therefore, recirculating cooling water system water pump fan combination frequency conversion optimization fortune proposed by the present invention
Row scheme energy-saving effect is significant.
Claims (5)
1. a kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme determines method, which is characterized in that
The following steps are included:
Step A: recirculating cooling water system considers that the thermally equilibrated cooling water minimum of total system needs to flow under different computing environments operating condition
Amount, which calculates, to be determined；
Step B: recirculating cooling water system water pump parallel connection lift performance curve and system need lift performance curve to calculate determination；
Step C: recirculating cooling water system considers that the thermally equilibrated blower of total system determines operating condition water pump selection frequency conversion optimization operating scheme
It calculates and determines；
Step D: recirculating cooling water system considers that total system is thermally equilibrated while implementing water pump selection frequency conversion, fan frequency conversion optimization fortune
Row scheme, which calculates, to be determined；
Step E: recirculating cooling water system considers that the thermally equilibrated water pump fan combination frequency conversion of total system optimizes operating scheme energy consumption ratio
Compared with.
2. a kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme according to claim 1 is true
Determine method, which is characterized in that recirculating cooling water system considers that total system heat is flat under different computing environments operating condition described in step A
The solution procedure that the cooling water minimum of weighing apparatus needs flow rate calculation to determine is as follows:
Force ventilation reverse flow wet type cooling tower thermal equilibrium calculation uses Michael thermodynamic equilibrium equation:The equation left side is cooling tower filler characteristic quantity Ωn', it is solved to Ω 'n=B λk, equation the right is inverse
Streaming cooling tower working characteristics cools down number Ωn, using multistage Xin Puxun solving method, when cooling tower Inlet and outlet water temperature difference t < 15 DEG C and
When computational accuracy is of less demanding, it is reduced toWherein Q is circulation
Cooling water flow, m3/s；βxvFor with volume Evapotranspiration matter coefficient caused by water capacity difference, kg/ (m2·s)；V is cooling tower filler
Volume, m3；K is the heat gain coefficient that evaporated water is taken away；t1、t2Respectively into tower water temperature and outlet water temperature, DEG C；Dt is infinitesimal
The temperature of the lower disengaging packing layer of height dZ variation, DEG C；Subscript θ, t is respectively air themperature and water temperature, DEG C；i”For saturated air
Enthalpy, kJ/kg (DA)；I is air specific enthalpy, kJ/kg (DA)；CwFor the specific heat of recirculated water, kJ/ (kg DEG C) takes 4.1868kJ/
(kg·℃)；λ is the mass ratio of the air (in terms of dry air) and the recirculated water into filler into filler；B, k is packing
Experimental constant, subscript 1,2, m are respectively cooling tower import, outlet, intermediate position in tower；
Containing salts such as calcium carbonate, magnesium carbonate in industrial water, solubility reduces as the temperature rises, and salt is formed after being precipitated
Dirt knot is attached to inner wall of the pipe, and heat-transfer effect reduces, therefore circulating cooling hydraulic art heat exchange side outlet temperature in shell and tube exchanger
Control is being not higher than 45 DEG C；Temperature is one of key factor in need of consideration, the direct shadow of the height of temperature in chemical enginnering process
It rings the length of chemical time, influence the conversion ratio and quality of product, therefore the temperature of heat exchanger cooled medium need to be controlled strictly
System；
According to the heat exchange principle of heat exchanger, heat transfer equation is q=hS △ tm, the contra-flow heat exchanger outlet Cooling and Heat Source temperature difference is larger, right
Number mean temperature difference Δ tmCalculation formula isEquation of heat balance is qc=Ccmc(tco-tci),
Heat transfer equation and logarithmic mean temperature difference (LMTD) are brought into equation of heat balance, q=qc, calculate heat exchanger cooling water minimum and need flow
ForCooling water outlet temperature is maximum permissible temperature in formula, that is, takes tco=tcomax=
45 DEG C, mcAs cooling water minimum needs flow；Recirculating cooling water system cooling water minimum needs in the solution of flow, needs to exchange
The temperature of hot device cooling water outlet temperature and cooled medium is controlled, and considers the thermally equilibrated circulating cooling water system of cooling tower
System, it is that each heat exchangers in parallel minimum needs the sum of cooling water flow in system that system cooling water minimum, which needs flow, is calculated public
Formula isWherein mcFor cooling water mass flow, kg/s；Q is thermic load, kW；CcFor cooling water specific heat capacity,
kJ/(kg·℃)；thi、thoRespectively cooled medium import and export temperature, DEG C；tci、tcoRespectively cooling water import and export temperature
Degree, DEG C；H is heat transfer coefficient of heat exchanger, kW/ (m2·℃)；S is heat exchanger heat exchange area, m2；QzIt is cold for recirculating cooling water system
But water minimum needs total flow, m3/s；QiVolume flow, m are needed for i-th layer of cooling water minimum of system3/s；mc,iIt is cold for i-th layer
But water minimum needs mass flow, kg/s；N is the number of plies in parallel in system；ρ is cooling water density, kg/m3；
Ignore the thermal loss and water loss of pipeline in recirculating cooling water system, it is known that cooling load, the practical pipeline of system are special
Property, cooled medium peak optimization reaction temperature and cooling water outlet maximum permissible temperature, by programming, iterate to calculate out different rings
Recirculating cooling water system cooling water minimum needs water flow at a temperature of border；
Heat Balance Calculation process are as follows: wet-bulb temperature t is first setsOutlet water temperature t as cooling tower2, as technique heat exchange side-entrance
Water temperature considers that each parallel branch cooled medium is cooling and requires, while controlling heat exchanger cooling water outlet temperature tco≤ 45 DEG C and
The temperature of cooled medium is met the requirements, and utilizes mc、QzThe exit water temperature t after each parallel branch heat exchange is calculated in formulacoiWith
Corresponding cooling water flow Qi, i represents parallel branch number, by adjusting each branch operation water of parallel branch return water tube valve change
Flow QiIt meets the requirements, each way outlet cooling water is mixed to get technique heat exchange side outlet main pipe cooling water temperature t1With total stream
Measure Qz, as cooling tower is re-circulated into cooling tower and carries out heat exchange heat dissipation, utilize Ω into tower water temperature and water flown ’、ΩnFormula
The outlet water temperature t that will be obtained2 ’With the outlet water temperature t of last cycle calculations2It is compared, if | t2 ’- t2|≤0.001, then be
System technique heat exchange side and cooling tower heat exchange side reach thermal balance, obtain the cooling water total flow Q of system at this timezWith ventilation quantity G；If
|t2 ’- t2| > 0.001, the two difference is larger, then with this outlet water temperature t2 ’Substitution re-starts cycle calculations, until thermal balance；
Each branch cooling water flow is that the minimum of corresponding branch needs flow when thermal balance, total cooling water flow be system cooling water most
It is small to need flow.
3. a kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme according to claim 1 is true
Determine method, which is characterized in that recirculating cooling water system described in step C considers that the thermally equilibrated blower of total system determines operating condition water pump group
It is as follows to close the determining solution procedure of frequency conversion optimization operating scheme calculating:
In recirculating cooling water system, blower determine revolving speed operation, water pump can carry out operation number of units Combinatorial Optimization operation, combination become valve it is excellent
Change operation, combination frequency control optimization operation；The operation of water pump operation number of units Combinatorial Optimization, is followed according under different computing environments operating condition
It includes the optimal of number of units and size that ring cooling water system, which considers that the thermally equilibrated cooling water minimum of total system needs flow selection water pump,
Operation combination, avoids flow is excessive from causing energy waste；But the operation of number of units Combinatorial Optimization is run, cools down water flow in most cases
Amount is still excessive, causes energy waste, if reducing 1 operation water pump, water-supply shortages；Water pump selection becomes valve optimization fortune
Row changes system pipe network necessary head curve of the installation system by controlling opening of valve, and regulating system circulating water flow controls each branch in parallel
Road meets the water flow of load heat transfer requirements, reduces annual operation energy consumption；But valve regulated increases resistance of pipe system, causes
Energy consumption increases, water pump selection frequency control optimization operation, on the basis of water pump operation number of units Combinatorial Optimization, according to water pump assembly
Variable Frequency Speed Regulation Principle makes a water pump assembly for participating in running implement to become under the premise of meeting cooling water minimum and needing flow
Frequency speed governing operation, can be significantly reduced system energy consumption；
(1) combination of water pump optimized operation and its range of flow determine
To meet the pressure requirements at system least favorable, the setting water pump size combinations method of operation is small by the big pump of separate unit, separate unit
Pump, the lift performance curve of the 1 various parallel combinations that big 1 small pump group is closed and 2 big pump groups are closed and system need lift performance curve
Simultaneous solution determines that water pump operation operating point is that water pump difference runs combined separation A, B, C, D point；When system cooling water most
It is small that flow is needed to be less than QBWhen, select the small pump operation of separate unit；When system cooling water minimum needs flow in QB~QABetween when, choosing
With the big pump operation of separate unit；When system cooling water minimum needs flow in QA~QCBetween when, select 1 big pump, 1 small pump and through transport
Row；When system cooling water minimum needs flow in QC~QDBetween when, select 2 big pump parallel runnings；
(2) water pump selection frequency conversion optimization operating scheme, which calculates, determines
Flow selection water pump optimized operation combination is needed according to system minimum, it is cooling that usual system cooling water flow is still greater than system
Water minimum needs flow, and it is inadequate to open a unit flow less, at this point, run again by separate unit water pump assembly frequency conversion optimization,
Under the premise of meeting cooling require, energy consumption is further decreased；There are two types of single pump frequency conversion running optimizatin methods: being needed with system minimum
It wants water flow to determine single pump optimized operation revolving speed, water pump optimized operation revolving speed is determined with variable frequency pump efficiency highest；Again this two
In kind frequency conversion optimization method, the frequency conversion optimization method finally used is determined with energy consumption minimum: water is needed with system cooling water minimum
Flow determines that single pump operation revolving speed carries out water pump selection frequency conversion optimization operation；
It needs flow to determine the combination of water pump optimized operation and meet the minimum lift of positive pressure according to system cooling water minimum to determine a little
O carries out pump variable frequency according to the similar operating condition parabola for crossing point O, according to affinity law of pump, calculates and determines pump variable frequency ratio δpn,
Pump head performance curve H after frequency conversionbp1It indicates are as follows:
Meet system cooling water minimum need flow and supply water positive pressure request under the premise of, annual different computing environments operating condition
When, mathematic optimal model is established with the minimum target of pump assembly input power；
When system separate unit pump variable frequency is run,
Objective function:
Constraint condition:
When 2 parallel connection pumps of system, single pump frequency conversion operation, a rated speed, another converting operation are controlled,
Objective function is
Constraint condition:
Wherein: NpbpFor water pump assembly input power, kW；ηpFor pump efficiency；ηcFor the transmission efficiency of water pump and necessary electromotor；ηem
Motor efficiency when for water pump operation；ηbpFor water pump assembly frequency converter efficiency；QrminFlow is needed for system cooling water minimum,
m3/s；QpmaxFor water pump maximum critical flow, m3/s；Npemin、NpemaxRespectively separate unit water pump assembly frequency converter allows minimum defeated
Enter power, allow maximal input, kW；Traffic constraints condition indicates that separate unit water pump operation flow must satisfy different calculating rings
System minimum needs the requirement of flow under the operating condition of border, and is no more than total maximum stream flow of all operation water pumps；Power constraints
Indicate the control of separate unit water pump assembly input power in reasonable pump assembly input power range；Gear ratio constraint condition indicates single
The allowed band of platform water pump gear ratio, than too small, pump efficiency decline is obvious for frequency conversion；Frequency conversion influences water pump assembly peace than excessive
Entirely；Subscript 1 indicates variable frequency pump unit, and subscript 2 indicates not frequency conversion water pump assembly；
Add up each calculating environmental working condition blower and pump energy consumption, obtains recirculating cooling water system whole year operation total energy consumption:
Wherein, AzTotal energy consumption, kWh are run for system whole year；M is annual different computing environments operating condition setting kind number, i.e., annual system
System minimum needs flow kind number；NfeεEnvironmental working condition rated speed blower unit input power, kW are calculated for ε kind；NpbpεIt is
ε kind calculates environmental working condition variable frequency pump unit input power, kW；thεEnvironmental working condition system operation time, h are calculated for ε kind.
4. a kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme according to claim 1 is true
Determine method, which is characterized in that recirculating cooling water system described in step D considers that total system is thermally equilibrated while implementing water pump group
The solution procedure that conjunction frequency conversion, fan frequency conversion optimization operating scheme calculate determination is as follows:
Since blower angular adjustment is inconvenient and angle modulation is costly, so blower optimization operation selection fixed blade established angle frequency conversion
Adjust the speed optimizing operation method；It is minimum with the annual total operation energy consumption of cooling water system water pump fan under the premise of guaranteeing cooling purpose
For target, while implementing water pump selection frequency conversion, fan frequency conversion Operation Mode Optimization；
Specific method: setting fan frequency conversion is than range 0.6~1.1, when certain wet-bulb temperature, to the rotation speed of fan of any determination,
The method of applying step A~C determines that water pump selection frequency conversion optimizes operating scheme, calculates water pump selection when multiple rotation speed of fan
Frequency conversion optimizes operating scheme；
When a certain wet-bulb temperature, when recirculating cooling water system blower fan of cooling tower frequency conversion is smaller, rotation speed of fan is lower, power compared with
It is small, but air quantity is also smaller, and cooling tower cooling effect is poor, is system cooling effect, it is desirable that system cooling water flow is larger, water pump
Unit input power is larger；With the increase of fan frequency conversion ratio, rotation speed of fan and power increase, and cooling tower ventilating and cooling effect mentions
Height, cooling water minimum need flow to reduce, and pump power decline, recirculating cooling water system total power input first reduces to be increased afterwards,
Obtain corresponding blower optimal frequency conversion ratio δ when system total power input minimumfnopt；
Method according to this, when calculating annual different wet bulb temperature calcuation environmental working conditions when recirculating cooling water system total power input minimum
The corresponding optimal frequency conversion of blower when corresponding water pump operation combination and separate unit frequency conversion ratio, so that it is determined that recirculating cooling water system water
It pumps blower combination frequency conversion and optimizes operating scheme.
5. a kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme according to claim 1 is true
Determine method, which is characterized in that recirculating cooling water system described in step E considers that the thermally equilibrated water pump fan combination of total system becomes
The process that frequency optimization operating scheme energy consumption compares is as follows:
Calculating compares that recirculating cooling water system original blower fan water pump whole year determines operating condition operating scheme energy consumption, blower determines operating condition water pump selection
Frequency conversion optimizes operating scheme energy consumption and water pump selection frequency conversion, fan frequency conversion optimize operating scheme energy consumption, obtains while implementing water pump
Combine frequency conversion, fan frequency conversion optimization operating scheme-i.e. water pump fan combination frequency conversion optimization operating scheme whole year energy consumption minimum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811217598.4A CN109460861B (en) | 2018-10-18 | 2018-10-18 | Method for determining water pump and fan combination frequency conversion optimization operation scheme of circulating cooling water system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811217598.4A CN109460861B (en) | 2018-10-18 | 2018-10-18 | Method for determining water pump and fan combination frequency conversion optimization operation scheme of circulating cooling water system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109460861A true CN109460861A (en) | 2019-03-12 |
| CN109460861B CN109460861B (en) | 2021-12-17 |
Family
ID=65607946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811217598.4A Active CN109460861B (en) | 2018-10-18 | 2018-10-18 | Method for determining water pump and fan combination frequency conversion optimization operation scheme of circulating cooling water system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109460861B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109917656A (en) * | 2019-03-29 | 2019-06-21 | 重庆大学 | Recirculated cooling water minimum differntial pressure energy-saving control system and method based on processing medium multi-temperature target |
| CN110287646A (en) * | 2019-07-17 | 2019-09-27 | 招商局邮轮制造有限公司 | A kind of thermally equilibrated calculation method of series connection cooling system |
| CN110528620A (en) * | 2019-09-17 | 2019-12-03 | 西安热工研究院有限公司 | A kind of cooling unit of closed cycle can depth frequency conversion riverside makeup Water System |
| CN113095545A (en) * | 2021-03-12 | 2021-07-09 | 国网河北能源技术服务有限公司 | Method and device for determining optimal operating frequency of cooling fan of air-cooled condenser and terminal |
| CN113112060A (en) * | 2021-04-02 | 2021-07-13 | 华自科技股份有限公司 | Lifting pump station scheduling method and device based on soft flow measurement and computer equipment |
| CN113834681A (en) * | 2021-07-27 | 2021-12-24 | 湖南凯利特能源科技有限公司 | Dynamic energy-saving evaluation method and evaluation system for evaporative air cooler group |
| CN115265024A (en) * | 2022-06-14 | 2022-11-01 | 浙江中控技术股份有限公司 | Integrated control optimization method for circulating cooling water system |
| WO2023138325A1 (en) * | 2022-01-18 | 2023-07-27 | 光大环保技术装备（常州）有限公司 | Cooling medium temperature regulation and control method, system and device for circulating cooling system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508474A (en) * | 2011-11-01 | 2012-06-20 | 杭州哲达科技股份有限公司 | Circulated cooling water operation optimization control system for industrial enterprise |
| CN102852782A (en) * | 2012-09-25 | 2013-01-02 | 扬州大学 | Large-scale water pump unit and working condition adjusting mode accurate quantitative model-selection method |
| CN104131983A (en) * | 2014-07-24 | 2014-11-05 | 扬州大学 | Method for determining optimal combination operation scheme of circulating cooling water system water pump units and adjusting valves of petrochemical enterprise |
| CN106251079A (en) * | 2016-08-04 | 2016-12-21 | 扬州大学 | Industrial circulating cooling water system cools down Energy Efficiency Ratio energy consumption comprehensive evaluation index and method every year |
-
2018
- 2018-10-18 CN CN201811217598.4A patent/CN109460861B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508474A (en) * | 2011-11-01 | 2012-06-20 | 杭州哲达科技股份有限公司 | Circulated cooling water operation optimization control system for industrial enterprise |
| CN102852782A (en) * | 2012-09-25 | 2013-01-02 | 扬州大学 | Large-scale water pump unit and working condition adjusting mode accurate quantitative model-selection method |
| CN104131983A (en) * | 2014-07-24 | 2014-11-05 | 扬州大学 | Method for determining optimal combination operation scheme of circulating cooling water system water pump units and adjusting valves of petrochemical enterprise |
| CN106251079A (en) * | 2016-08-04 | 2016-12-21 | 扬州大学 | Industrial circulating cooling water system cools down Energy Efficiency Ratio energy consumption comprehensive evaluation index and method every year |
Non-Patent Citations (1)
| Title |
|---|
| 张吉礼等: "大型公建空调系统节能控制研究进展", 《建筑热能通风空调》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109917656B (en) * | 2019-03-29 | 2022-03-01 | 重庆大学 | Circulating cooling water minimum pressure difference energy-saving control system and method based on process medium multi-temperature target |
| CN109917656A (en) * | 2019-03-29 | 2019-06-21 | 重庆大学 | Recirculated cooling water minimum differntial pressure energy-saving control system and method based on processing medium multi-temperature target |
| CN110287646B (en) * | 2019-07-17 | 2023-02-28 | 招商局邮轮制造有限公司 | Calculation method for heat balance of series cooling system |
| CN110287646A (en) * | 2019-07-17 | 2019-09-27 | 招商局邮轮制造有限公司 | A kind of thermally equilibrated calculation method of series connection cooling system |
| CN110528620A (en) * | 2019-09-17 | 2019-12-03 | 西安热工研究院有限公司 | A kind of cooling unit of closed cycle can depth frequency conversion riverside makeup Water System |
| CN113095545A (en) * | 2021-03-12 | 2021-07-09 | 国网河北能源技术服务有限公司 | Method and device for determining optimal operating frequency of cooling fan of air-cooled condenser and terminal |
| CN113095545B (en) * | 2021-03-12 | 2022-09-20 | 国网河北能源技术服务有限公司 | Method and device for determining optimal operating frequency of cooling fan of air-cooled condenser and terminal |
| CN113112060A (en) * | 2021-04-02 | 2021-07-13 | 华自科技股份有限公司 | Lifting pump station scheduling method and device based on soft flow measurement and computer equipment |
| CN113834681A (en) * | 2021-07-27 | 2021-12-24 | 湖南凯利特能源科技有限公司 | Dynamic energy-saving evaluation method and evaluation system for evaporative air cooler group |
| CN113834681B (en) * | 2021-07-27 | 2024-01-30 | 湖南凯利特能源科技有限公司 | Dynamic energy-saving assessment method and system for evaporative air cooler group |
| WO2023138325A1 (en) * | 2022-01-18 | 2023-07-27 | 光大环保技术装备（常州）有限公司 | Cooling medium temperature regulation and control method, system and device for circulating cooling system |
| CN115265024A (en) * | 2022-06-14 | 2022-11-01 | 浙江中控技术股份有限公司 | Integrated control optimization method for circulating cooling water system |
| CN115265024B (en) * | 2022-06-14 | 2023-11-24 | 浙江中控技术股份有限公司 | Integrated control optimization method for circulating cooling water system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109460861B (en) | 2021-12-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109460861A (en) | A kind of chemical circulation cooling water system water pump fan combination frequency conversion optimization operating scheme determines method | |
| CN109519360B (en) | Optimal operation scheme comparison and determination method for water pump unit of chemical circulating cooling water system | |
| CN104251529B (en) | A kind of combined type refrigerant multi-gang air conditioner | |
| CN104024749B (en) | Air-conditioning system that adjusts temperature and humidity | |
| CN107451397B (en) | Cooling tower fan based on optimized operation and adjusting mode accurate quantitative optimization selection method | |
| CN109269021A (en) | Air conditioner system energy saving running optimizatin dispatching method | |
| CN104266314A (en) | Control method for combined refrigerating multi-split air conditioner system | |
| JP2006275397A (en) | Cold/hot water control method for air conditioner | |
| CN107490319A (en) | Cooling tower half adjusts the annual determination method for becoming angle and optimizing operating scheme of blower fan | |
| CN106482336A (en) | One kind makes Teat pump boiler winter go out the maximized plus hot water method of heat | |
| CN106979545A (en) | A kind of utilization heat pump extracts once the heating plant of net backwater heat | |
| CN104848708A (en) | Air cooling island array control method based on temperature field and velocity field | |
| Zhang et al. | The model predictive control strategy of the transcritical CO2 air conditioning system used in railway vehicles | |
| CN102818326A (en) | Large temperature difference air conditioning system for heat extraction of data center and using method thereof | |
| CN207065759U (en) | A kind of heat dissipation system for computer room with recuperation of heat/full natural cooling | |
| CN106969429A (en) | Air draft, air-conditioning and heat-pump hot-water plant capacity gradient utilization system and method | |
| CN206291391U (en) | Air-conditioning device based on Double-temperature water chilling unit | |
| CN206803293U (en) | A kind of heating plant that net backwater heat is extracted once using heat pump | |
| CN206572659U (en) | Tandem Double-temperature water chilling unit | |
| CN108534570A (en) | A kind of absorption big temperature difference heat-exchange unit | |
| CN108112224A (en) | A kind of liquid cooling heat-exchanger | |
| CN204063423U (en) | A kind of combined type refrigerant multi-gang air conditioner | |
| CN204665444U (en) | A kind of heat pump directly-heated type heating system with indoor set | |
| CN206132413U (en) | A economizer system for air - conditioner test process | |
| Yang et al. | Comparative study of three hybrid air-conditioning systems based on multiple evaporative coolers and run-around reheating coils |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |